基于性能反馈的PSO算法速度上限调整策略

速度上限是影响微粒群算法性能的一个主要参数。针对现有调节策略存在参数统一设置、与微粒性能无关等缺点,本文提出一种基于性能反馈的调整策略,使得速度上限能随着个体性能的改变而动态调整,从而更加真实有效的模拟了鸟类觅食的群体行为特征。仿真结果表明该算法能较好地提高微粒群算法的计算效率。     

Experimental effects of receiving negative weight-related feedback: a weight guessing study

The effects of receiving negative verbal weight-related feedback on the mood, self-esteem, and body image of restrained and unrestrained eaters were investigated. Female undergraduate students either reported their current weight (no feedback) or had their weight guessed as 15 lb higher than their actual weight (negative feedback) by an experimenter who presented herself as either an undergraduate (peer) or graduate student (non-peer). Participants overall had higher anxiety and felt “fatter” in the negative feedback condition. When this feedback came from a peer they felt fatter, more dissatisfied with their bodies, and, for restrained eaters, more depressed, as compared to when it came from a non-peer. These results provide empirical evidence that negative weight-related feedback produces adverse psychological consequences for young women, especially restrained eaters, and suggest the importance of peers’ perceptions of weight.     

The perseverance effect in the debriefing paradigm: Replication and extension

A classic study conducted by Ross, Lepper, and Hubbard (1975) revealed a perseverance effect wherein people who received positive performance feedback on an alleged social perceptiveness test reported more favorable self-perceptions in this domain than those who received negative feedback despite the fact that they had received standard outcome debriefing (i.e., been informed about the false, predetermined, and random nature of the feedback) prior to reporting self-assessments. The present studies extend this past research by revealing that (a) there is a form of outcome debriefing (i.e., informing participants about the bogus nature of the test as well as the bogus nature of the feedback) that effectively eliminates the perseverance effect, (b) the perseverance effect that occurs after standard outcome debriefing is limited to perceptions of specific task-relevant skills rather than more global abilities, and (c) affective reactions do not underlie the perseverance effect that occurs in the false feedback paradigm.     

Reciprocal peer management: Improving staff instruction in a vocational training program

To test the feasibility and utility of involving peers as sources of feedback, 6 subjects, instructors in a vocational program for adults with mental retardation, participated in a staff training and management program. Subjects' teaching interactions were assessed during baseline, in-service training (on effective teaching), return-to-baseline, peer management, and follow-up phases. Peer management was introduced in multiple baseline fashion across pairs of subjects. Members of each pair were trained to monitor peer teaching, to record and graph data, to provide feedback, and to set goals with the peer. Each pair then performed these procedures on the job for several weeks, during which time 4 of the 6 subjects increased their use of effective teaching methods (over baseline). However, inconsistencies in the magnitude and durability of these increases require that the study be viewed as inconclusive, although it has heuristic value as a promising model for involving co-workers in staff management programs.     

具体情绪及非依随反馈方式对自我妨碍的影响

该研究采用实验法考察了具体情绪以及非依随反馈方式对自我妨碍的影响。被试为104名大学生。结果表明：1）愉快组被试做出的决策型自我妨碍行为较少;恐惧组被试做出的回避型自我妨碍较多。2）两种非依随反馈方式对自我妨碍的影响没有显著差异。3）无论是决策型自我妨碍还是回避型自我妨碍,男生均高于女生。     

On the dynamics of dying

This study is concerned with dynamic processes that underly the rapid, degenerative changes associated with the “dying” stage of the multicellular organism's life cycle. The interaction between negative and positive feedback cycles is discussed: negative feedback cycles underly the superstability characteristic of health and illness. When negative feedback cycles fade in the dying phase of life, positive feedback cycles, previously held in check by the negative feedback cycles to which they had been coupled, rise explosively, driving physiologic variables from their normal values towards extremes. This results in the rapid downturn that we associate with dying—an accelerating disintegration terminating in death. A medical case history is analyzed.     

We're all in this together now: group performance feedback to increase classroom team data collection

This study's primary goal was to evaluate the use of performance feedback procedures delivered to a classroom team to increase daily data collection. Performance feedback (PFB) was delivered to four classroom teams responsible for the daily collection of data representing student performance during prescribed instructional activities. Using a multiple-baseline design, the effects of the team performance-feedback were evaluated for the target student, and for generalization to data collection for all classroom students. A secondary question evaluated if student on-task behavior correlated with increased data collection. Finally, social validity was investigated to evaluate team satisfaction with the PFB intervention. The results demonstrate improved data collection across all four classroom teams for the target student in each classroom and generalization within classrooms to all remaining students. Slight increases in student on-task behavior were observed in three of the four classrooms, and teacher satisfaction ratings were high.     

Control of Integrated Task Sequences Shapes Components of Reaching

Reaching toward an object usually consists of a sequence of elemental actions. Using a reaching task sequence, the authors investigated how task elements of that sequence affected feedforward and feedback components of the reaching phase of the movement. Nine right-handed adults performed, with their dominant and nondominant hands, 4 tasks of different complexities: a simple reaching task; a reach-to-grasp task; a reach-to-grasp and lift object task; and a reach-to-grasp, lift, and place object task. Results showed that in the reach-to-grasp and lift object task more time was allocated to the feedforward component of the reach phase, while latency between the task elements decreased. We also found between-hand differences, supporting previous findings of increased efficiency of processing planning-related information in the preferred hand. The presence of task-related modifications supports the concept of contextual effects when planning a movement.     

The Roles of Explanation and Feedback in False Belief Understanding: A Microgenetic Analysis

The authors examined effects of feedback and explanation on false belief performance. Thirty-three children (42–54 months; 15 girls, 18 boys) were randomly assigned to four treatment conditions: explanation, feedback, feedback researcher explains, and feedback child explains. Children completed false belief tasks during pretraining, 8 training sessions, and posttraining across 6 weeks. Language comprehension was assessed at pretraining. The authors hypothesized that children would improve most when training involved feedback and explanation. Generalized estimating equations modeling was used to analyze the data. Children who received feedback and generated explanations for characters’ false beliefs improved across training sessions more so than children in other conditions. Children's explanations for false beliefs also were explored. Implications of the findings are discussed.     

Effects of Classically Differentiated Supplementary Feedback Cues on Tracking Skill

Although previous studies had shown that classical predifferentiation of green (CS-j and red (CS+) cues enabled them to facilitate tracking performance when used as supplementary indicators of correct and incorrect responses respectively, the studies were inconclusive concerning specific conditional properties versus nonspecific arousal consequences of the cues. A sample of 108 Ss was exposed to the same predifferentiation procedure, but then were subgrouped in terms of the kind of feedback signal received in tracking (no signal, red only, green only, both signals). A nonspecificity theory predicts subgroup equality of tracking performances while specificity theory predicts the dependence of performance level on the kind of signal received. Results corroborated previous findings and the view that tracking effects were reasonably attributable to the transfer of specific stimulus functions generated in the differentiation trials.